For the application of articles R. 4226-5 and R. 4226-6 in premises or locations where explosive atmospheres may occur, the employer shall implement the provisions of section 6 of chapter VII of this title relating to the prevention of explosions.
In these premises or locations, maintenance, measurements and tests may only be undertaken with the written authorisation of the head of the establishment and in accordance with his instructions. If the equipment used to carry out these operations is not specially designed for this type of location, the location must first be made non-hazardous.